What is the difference between Routing and Call OSB regarding preformance?

Hi excuse my ignorance, I am new to OSB and would like to know the difference in the performance of a service using the Service Callout or Routting, which would be the fastest to run?
would like to know this to know what the best to use if I have a situation that you can use either one.
Thanks!

service call out .. you call a service in a SYNCHRONOUS way (pipeline blocks and waits for service response).
we cannot use request-only wsdl operation through service callout.It is single threaded.
route ... it's the last node of the proxy, it's not in the pipeline, you pass all processing to another (business or proxy) service . Route node can be seen as an action which defines where a Request thread stops and Response thread begins, in addition to what ever it does. It is know that by-design, request and response pipelines of a OSB proxy will be in different threads.
route node can be (request-response and request only)
you can have multiple ServiceCallouts but only one route node.
Service callout under high load can cause stuck thread issues, so it has to be used wisely depending upon your requirement.
Hope this helps.
Regards,
Karan

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